Compression Test #'s - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 08-29-2008, 08:04 PM   #1
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default Compression Test #'s

Well, It's been almost six months since my miata has ran.. I just havent had time to mess with it lately. Anyways, I took the time today to get it running (320cc injectors on stock ECU, Idled pretty smooth)

I let it warm up and did a compression test to see if i might need to replace rings/rebuild the head before I boost it. I was consistant with the amount of oil i added to each cylinder, but im not sure if the amount i added was enough.

Anyways heres my numbers.

DRY / WET
190 195
173 180
178 181
210 220

It's odd that #4 cylinder is so much higher, thats how it was last time I tested it also.

I had oil on my plug threads when i pulled them, but then i noticed i had spilled oil all in the valley of the VC where the spark plug holes are, so maybe thats where it came from.

On another note, I think my igniter may be going bad or something, because when i started it for the first time, the dash took a few seconds to kick on. But the next time i started it, nothing, it was just dead.
greenday3437 is offline   Reply With Quote
Old 08-29-2008, 08:08 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

they all increase fairly evenly with a little oil...if #4 was already soaking in some could be why it's higher, or the rings are letting some blow-by through. I wouldn't be too worried about them...
Braineack is offline   Reply With Quote
Old 08-29-2008, 08:11 PM   #3
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,793
Total Cats: 247
Default

Looks good. Run it.
patsmx5 is offline   Reply With Quote
Old 08-29-2008, 08:20 PM   #4
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default

Quote:
Originally Posted by Braineack View Post
they all increase fairly evenly with a little oil...if #4 was already soaking in some could be why it's higher, or the rings are letting some blow-by through. I wouldn't be too worried about them...
That's kinda what I was thinking, I was surprised how it started on the first try and ran so smooth, not drama except some grease burning off the header pipes.

Now to pull the performance parts off the LT1 camaro so I can sell them and start buying stuff for the miata again.
greenday3437 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:48 AM.